Acoustic RF resonator parallel capacitance compensation

ABSTRACT

RF circuitry, which includes a first acoustic RF resonator (ARFR), a first compensating ARFR, and a second compensating ARFR, is disclosed. The first compensating ARFR is coupled between a first inductive element and a first end of the first ARFR. The second compensating ARFR is coupled between a second inductive element and a second end of the first ARFR. The first inductive element and the second inductive element are negatively coupled to one another. The first compensating ARFR, the second compensating ARFR, the first inductive element, and the second inductive element at least partially compensate for a parallel capacitance of the first ARFR.

RELATED APPLICATIONS

The present application claims the benefits of U.S. provisional patentapplication No. 62/096,801, filed Dec. 24, 2014, and U.S. provisionalpatent application No. 62/109,693, filed Jan. 30, 2015.

The present application is related to concurrently filed U.S. patentapplication Ser. No. ______ entitled “SIMPLIFIED ACOUSTIC RF RESONATORPARALLEL CAPACITANCE COMPENSATION.”

All of the applications listed above are hereby incorporated herein byreference in their entireties.

FIELD OF THE DISCLOSURE

Embodiments of the present disclosure relate to radio frequency (RF)communications systems, which may include RF front-end circuitry, RFtransceiver circuitry, RF transmit circuitry, RF receive circuitry, RFdiplexers, RF duplexers, RF filters, RF antennas, RF switches, RFcombiners, RF splitters, the like, or any combination thereof.

BACKGROUND

As wireless communications technologies evolve, wireless communicationssystems become increasingly sophisticated. As such, wirelesscommunications protocols continue to expand and change to take advantageof the technological evolution. As a result, to maximize flexibility,many wireless communications devices must be capable of supporting anynumber of wireless communications protocols, each of which may havecertain performance requirements, such as specific out-of-band emissionsrequirements, linearity requirements, or the like. Further, portablewireless communications devices are typically battery powered and needto be relatively small, and have low cost. As such, to minimize size,cost, and power consumption, RF circuitry in such a device needs to beas simple, small, flexible, high performance, and efficient as ispractical. Thus, there is a need for RF circuitry in a communicationsdevice that is low cost, small, simple, flexible, high performance, andefficient.

SUMMARY

RF circuitry, which includes a first acoustic RF resonator (ARFR), afirst compensating ARFR, and a second compensating ARFR, is disclosed.The first compensating ARFR is coupled between a first inductive elementand a first end of the first ARFR. The second compensating ARFR iscoupled between a second inductive element and a second end of the firstARFR. The first inductive element and the second inductive element arenegatively coupled to one another. The first compensating ARFR, thesecond compensating ARFR, the first inductive element, and the secondinductive element at least partially compensate for a parallelcapacitance of the first ARFR.

Those skilled in the art will appreciate the scope of the disclosure andrealize additional aspects thereof after reading the following detaileddescription in association with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings incorporated in and forming a part of thisspecification illustrate several aspects of the disclosure, and togetherwith the description serve to explain the principles of the disclosure.

FIG. 1A shows a first acoustic RF resonator (ARFR) and a load resistiveelement according to the prior art.

FIG. 1B illustrates a simplified behavioral model of the first ARFRillustrated in FIG. 1 according to the prior art.

FIG. 2A is a graph illustrating an electrical impedance of the firstARFR over an operating frequency ranges of the first ARFR according tothe prior art.

FIG. 2B is a graph illustrating a preferred electrical impedance of thefirst ARFR over the operating frequency ranges of the first ARFRaccording to one embodiment of the present disclosure.

FIG. 3 shows RF circuitry according to one embodiment of the RFcircuitry.

FIG. 4 shows the RF circuitry according to an alternate embodiment ofthe RF circuitry.

FIG. 5 shows details of a capacitance circuit illustrated in FIG. 4according to one embodiment of the capacitance circuit.

FIG. 6 shows details of the capacitance circuit illustrated in FIG. 4according to an alternate embodiment of the capacitance circuit.

FIG. 7 shows details of the capacitance circuit illustrated in FIG. 4according to an additional embodiment of the capacitance circuit.

FIG. 8 shows the RF circuitry according to an additional embodiment ofthe RF circuitry.

FIG. 9 shows the RF circuitry according to another embodiment of the RFcircuitry.

FIG. 10 shows the RF circuitry according to a further embodiment of theRF circuitry.

FIG. 11A shows the first ARFR and the load resistive element accordingto the prior art.

FIG. 11B shows the first ARFR, the load resistive element, and a firstparallel capacitance compensation circuit according to one embodiment ofthe first ARFR, the load resistive element, and the first parallelcapacitance compensation circuit.

FIG. 12A is a graph illustrating a magnitude of an RF output signalillustrated in FIG. 11A according to the prior art.

FIG. 12B is a graph illustrating a magnitude of the RF output signalillustrated in FIG. 11B according to one embodiment of the first ARFR,the load resistive element, and the first parallel capacitancecompensation circuit.

FIG. 13 shows the RF circuitry according to one embodiment of the RFcircuitry.

FIG. 14 shows the RF circuitry according to an alternate embodiment ofthe RF circuitry.

FIG. 15 shows details of the RF TX/RX multiplexer illustrated in FIG. 13according to one embodiment of the RF TX/RX multiplexer.

FIG. 16 shows details of the RF TX/RX multiplexer illustrated in FIG. 14according to an alternate embodiment of the RF TX/RX multiplexer.

FIG. 17A shows details of the first antenna, first RF RX bandpass filterillustrated in FIG. 15 according to one embodiment of the first antenna,first RF RX bandpass filter.

FIG. 17B shows details of the first antenna, second RF RX bandpassfilter illustrated in FIG. 15 according to one embodiment of the firstantenna, second RF RX bandpass filter.

FIG. 18A shows details of the first antenna, first RF RX bandpass filterillustrated in FIG. 15 according to one embodiment of the first antenna,first RF RX bandpass filter.

FIG. 18B shows details of the first antenna, second RF RX bandpassfilter illustrated in FIG. 15 according to one embodiment of the firstantenna, first RF TX bandpass filter.

FIG. 19A shows details of the first antenna, first RF RX bandpass filterillustrated in FIG. 15 according to one embodiment of the first antenna,first RF RX bandpass filter.

FIG. 19B shows details of the second antenna, first RF RX bandpassfilter illustrated in FIG. 16 according to one embodiment of the secondantenna, first RF RX bandpass filter.

FIG. 20A shows details of the first antenna, first RF TX bandpass filterillustrated in FIG. 15 according to one embodiment of the first antenna,first RF TX bandpass filter.

FIG. 20B shows details of the first antenna, second RF TX bandpassfilter illustrated in FIG. 15 according to one embodiment of the firstantenna, second RF TX bandpass filter.

FIG. 21A shows a portion of the RF circuitry according to one embodimentof the RF circuitry.

FIG. 21B shows a portion of the RF circuitry according to one embodimentof the RF circuitry.

DETAILED DESCRIPTION

The embodiments set forth below represent the necessary information toenable those skilled in the art to practice the disclosure andillustrate the best mode of practicing the disclosure. Upon reading thefollowing description in light of the accompanying drawings, thoseskilled in the art will understand the concepts of the disclosure andwill recognize applications of these concepts not particularly addressedherein. It should be understood that these concepts and applicationsfall within the scope of the disclosure and the accompanying claims.

RF circuitry, which includes a first acoustic RF resonator (ARFR), afirst compensating ARFR, and a second compensating ARFR, is disclosedaccording to one embodiment of the present disclosure. The firstcompensating ARFR is coupled between a first inductive element and afirst end of the first ARFR. The second compensating ARFR is coupledbetween a second inductive element and a second end of the first ARFR.The first inductive element and the second inductive element arenegatively coupled to one another. The first compensating ARFR, thesecond compensating ARFR, the first inductive element, and the secondinductive element at least partially compensate for a parallelcapacitance of the first ARFR.

RF circuitry, which includes the first ARFR and the first compensatingARFR, is disclosed according to an alternate embodiment of the presentdisclosure. The first inductive element is coupled between the firstcompensating ARFR and a first end of the first ARFR. The secondinductive element is coupled between the first compensating ARFR and asecond end of the first ARFR. The first compensating ARFR, the firstinductive element, and the second inductive element at least partiallycompensate for the parallel capacitance of the first ARFR. In oneembodiment of the first inductive element and the second inductiveelement, the first inductive element and the second inductive elementare negatively coupled to one another.

FIG. 1A shows a first ARFR 10 and a load resistive element RL accordingto the prior art. The first ARFR 10 and the load resistive element RLare coupled in series to ground to form an RF filter, which has RFbandpass filtering characteristics. The first ARFR 10 receives an RFinput signal RFN and a connection between the first ARFR 10 and the loadresistive element RL provides an RF output signal RFT.

FIG. 1B illustrates a simplified behavioral model of the first ARFR 10illustrated in FIG. 1 according to the prior art. According to thesimplified behavioral model, the first ARFR 10 has a series resistanceRS, a series inductance LS, and a series capacitance CS coupled inseries with one another. Additionally, the first ARFR 10 has a parallelcapacitance CP coupled in parallel with a series combination of theseries capacitance CS and the series inductance LS. As a result, thefirst ARFR 10 has a series resonant frequency F_(S) (FIG. 2A) and aparallel resonant frequency F_(P) (FIG. 2A).

FIG. 2A is a graph illustrating an electrical impedance of the firstARFR 10 (FIG. 1A) over an operating frequency range of the first ARFR 10(FIG. 1A) according to the prior art. When using the first ARFR 10 (FIG.1A) as a series element in an RF bandpass filter, preferably the seriesresonant frequency F_(S) falls within a passband of the RF bandpassfilter and the parallel resonant frequency F_(P) falls outside of thepassband of the RF bandpass filter. However, if the parallel capacitanceCP (FIG. 1B) of the first ARFR 10 is large, then a bandwidth of the RFbandpass filter may be too narrow to meet design requirements.Additionally, since the parallel capacitance CP (FIG. 1B) appearsprimarily across the first ARFR 10 (FIG. 1A), as frequency increases,impedance of the parallel capacitance CP (FIG. 1B) drops, therebydegrading RF bandpass filtering performance at higher frequencies.Reducing the parallel capacitance CP (FIG. 1B) drives the parallelresonant frequency F_(P) to higher values. However, the power handlingcapabilities of the first ARFR 10 (FIG. 1A) may be reduced belowrequirements. Thus, there is a need to reduce the effects of theparallel resonant frequency F_(P), particularly in RF bandpass filteringapplications.

One metric for quantifying bandpass filter effectiveness of the firstARFR 10 (FIG. 1A) is an RF coupling factor (k2e), which is defined asshown in EQ. 1 below.

k2e=[(π/2)*(F _(S) /F _(P))]/[tan((π/2)*(F _(S) /F _(P)))].   EQ. 1

As the parallel resonant frequency F_(P) increases relative to theseries resonant frequency F_(S), k2e increases, thereby improving thebandpass filter effectiveness of the first ARFR 10 (FIG. 1A). One way toincrease the parallel resonant frequency F_(P) of the first ARFR 10(FIG. 1A) is decrease a net parallel capacitance CP (FIG. 1A) of thefirst ARFR 10 (FIG. 1A).

FIG. 2B is a graph illustrating a preferred electrical impedance of thefirst ARFR 10 (FIG. 1A) over the operating frequency ranges of the firstARFR 10 (FIG. 1A) according to one embodiment of the present disclosure.As such, a first parallel capacitance compensation circuit 12 (FIG. 3)is coupled across the first ARFR 10 (FIG. 1A) to at least partiallycompensate for the parallel capacitance CP (FIG. 1B) of the first ARFR10 (FIG. 1A), thereby increasing the parallel resonant frequency F_(P)and increasing k2e.

FIG. 3 shows RF circuitry 12 according to one embodiment of the RFcircuitry 12. The RF circuitry 12 illustrated in FIG. 3 includes thefirst ARFR 10 and a first parallel capacitance compensation circuit 14,which includes a first compensating ARFR 16, a second compensating ARFR18,a first inductive element L1, and a second inductive element L2.

The first compensating ARFR 16 is coupled between the first inductiveelement L1 and a first end of the first ARFR 10. The second compensatingARFR 18 is coupled between the second inductive element L2 and a secondend of the first ARFR 10. The first inductive element L1 and the secondinductive element L2 have mutual coupling M between them as illustratedin FIG. 3. Further, the first inductive element L1 and the secondinductive element L2 are negatively coupled to one another asillustrated in FIG. 3. The first compensating ARFR 16, the secondcompensating ARFR 18, the first inductive element L1, and the secondinductive element L2 at least partially compensate for the parallelcapacitance CP (FIG. 1B) of the first ARFR 10. In general, in oneembodiment of the RF circuitry 12, the first parallel capacitancecompensation circuit 14 at least partially compensate for the parallelcapacitance CP (FIG. 1B) of the first ARFR 10.

The first inductive element L1 is coupled between the first compensatingARFR 16 and ground. The second inductive element L2 is coupled betweenthe second compensating ARFR 18 and the ground. In general, in oneembodiment of the first parallel capacitance compensation circuit 14,the first parallel capacitance compensation circuit 14 is a passivecircuit, which includes no active components.

In one embodiment of the first inductive element L1 and the secondinductive element L2, an absolute value of a coefficient of couplingbetween the first inductive element L1 and the second inductive elementL2 is greater than zero. In an alternate embodiment of the firstinductive element L1 and the second inductive element L2, the absolutevalue of the coefficient of coupling between the first inductive elementL1 and the second inductive element L2 is greater than 0.1. In anadditional embodiment of the first inductive element L1 and the secondinductive element L2, the absolute value of the coefficient of couplingbetween the first inductive element L1 and the second inductive elementL2 is greater than 0.2.

In one embodiment of the first inductive element L1 and the secondinductive element L2, the absolute value of the coefficient of couplingbetween the first inductive element L1 and the second inductive elementL2 is less than 0.7. In an alternate embodiment of the first inductiveelement L1 and the second inductive element L2, the absolute value ofthe coefficient of coupling between the first inductive element L1 andthe second inductive element L2 is less than 0.6. In an additionalembodiment of the first inductive element L1 and the second inductiveelement L2, the absolute value of the coefficient of coupling betweenthe first inductive element L1 and the second inductive element L2 isless than 0.5. In another embodiment of the first inductive element L1and the second inductive element L2, the absolute value of thecoefficient of coupling between the first inductive element L1 and thesecond inductive element L2 is less than 0.4. In a further embodiment ofthe first inductive element L1 and the second inductive element L2, theabsolute value of the coefficient of coupling between the firstinductive element L1 and the second inductive element L2 is less than0.3.

In one embodiment of the first inductive element L1 and the secondinductive element L2, an inductance of the first inductive element L1 isessentially equal to an inductance of the second inductive element L2.In an alternate embodiment of the first inductive element L1 and thesecond inductive element L2, the inductance of the first inductiveelement L1 is not equal to the inductance of the second inductiveelement L2.

In one embodiment of the first parallel capacitance compensation circuit14, the first parallel capacitance compensation circuit 14 augments RFbandpass filtering behavior of the first ARFR 10. In one embodiment ofthe first parallel capacitance compensation circuit 14, the firstparallel capacitance compensation circuit 14 increases a ratio of theparallel resonant frequency F_(P) (FIG. 2B) to the series resonantfrequency F_(S) (FIG. 2B).

In one embodiment of the first parallel capacitance compensation circuit14 and the first ARFR 10, the first parallel capacitance compensationcircuit 14 and the first ARFR 10 function as an RF bandpass filteringelement, such that the parallel resonant frequency F_(P) (FIG. 2B) fallsoutside of a passband of the RF bandpass filtering element.

In one embodiment of the first parallel capacitance compensation circuit14 and the first ARFR 10, the first parallel capacitance compensationcircuit 14 is coupled across the first ARFR 10, such that the firstparallel capacitance compensation circuit 14 presents a positivereactance across the first ARFR 10. A magnitude of the positivereactance is inversely related to frequency. Since the parallelcapacitance CP (FIG. 1B) of the first ARFR 10 presents a negativereactance across the first ARFR 10, such that the negative reactance isinversely related to frequency, the positive reactance at leastpartially cancels the negative reactance, thereby at least partiallycompensating for the parallel capacitance CP (FIG. 1B) of the first ARFR10.

In one embodiment of the first ARFR 10, the first compensating ARFR 16,and the second compensating ARFR 18, each of the first ARFR 10, thefirst compensating ARFR 16, and the second compensating ARFR 18 is asurface acoustic wave (SAW) RF resonator. In an alternate embodiment ofthe first ARFR 10, the first compensating ARFR 16, and the secondcompensating ARFR 18, each of the first ARFR 10, the first compensatingARFR 16, and the second compensating ARFR 18 is a bulk acoustic wave(BAW) RF resonator.

FIG. 4 shows the RF circuitry 12 according to an alternate embodiment ofthe RF circuitry 12. The RF circuitry 12 illustrated in FIG. 4 issimilar to the RF circuitry 12 illustrated in FIG. 3, except in the RFcircuitry 12 illustrated in FIG. 4, the first parallel capacitancecompensation circuit 14 further includes a capacitance circuit 20. Ingeneral, the capacitance circuit 20 is coupled between the firstinductive element L1 and the ground and is further coupled between thesecond inductive element L2 and the ground. In one embodiment of thecapacitance circuit 20, the capacitance circuit 20 is used to optimizethe first parallel capacitance compensation circuit 14 for improvedcompensation of the parallel capacitance CP (FIG. 1B) of the first ARFR10.

FIG. 5 shows details of the capacitance circuit 20 illustrated in FIG. 4according to one embodiment of the capacitance circuit 20. In thecapacitance circuit 20 illustrated in FIG. 5, a first end of the firstinductive element L1 is coupled to a first end of the second inductiveelement L2, such that the capacitance circuit 20 presents a shuntcapacitance CN between ground and both of the first inductive element L1and the second inductive element L2.

FIG. 6 shows details of the capacitance circuit 20 illustrated in FIG. 4according to an alternate embodiment of the capacitance circuit 20. Inthe capacitance circuit 20 illustrated in FIG. 6, the second inductiveelement L2 is coupled between the second compensating ARFR 18 andground, and the capacitance circuit 20 presents the shunt capacitance CNbetween ground and the first inductive element L1.

FIG. 7 shows details of the capacitance circuit 20 illustrated in FIG. 4according to an additional embodiment of the capacitance circuit 20. Inthe capacitance circuit 20 illustrated in FIG. 7, the first inductiveelement L1 is coupled between the first compensating ARFR 16 and ground,and the capacitance circuit 20 presents the shunt capacitance CN betweenground and the second inductive element L2.

FIG. 8 shows the RF circuitry 12 according to an additional embodimentof the RF circuitry 12. The RF circuitry 12 illustrated in FIG. 8 issimilar to the RF circuitry 12 illustrated in FIG. 4, except in the RFcircuitry 12 illustrated in FIG. 8, the capacitance circuit 20 isreplaced with a variable capacitance circuit 22. In one embodiment ofthe variable capacitance circuit 22, the variable capacitance circuit 22is used to vary the shunt capacitance CN illustrated in FIG. 5. In analternate embodiment of the variable capacitance circuit 22, thevariable capacitance circuit 22 is used to vary the shunt capacitance CNillustrated in FIG. 6. In an additional embodiment of the variablecapacitance circuit 22, the variable capacitance circuit 22 is used tovary the shunt capacitance CN illustrated in FIG. 7.

In one embodiment of the variable capacitance circuit 22, the variablecapacitance circuit 22 receives the first function configuration signalFCS1, such that the shunt capacitance CN is adjusted based on the firstfunction configuration signal FCS1.

FIG. 9 shows the RF circuitry 12 according to another embodiment of theRF circuitry 12. The RF circuitry 12 illustrated in FIG. 9 includes thefirst ARFR 10 and the first parallel capacitance compensation circuit14, which includes the first compensating ARFR 16, the first inductiveelement L1, and the second inductive element L2.

The first inductive element L1 is coupled between the first compensatingARFR 16 and a first end of the first ARFR 10. The second inductiveelement L2 is coupled between the first compensating ARFR 16 and asecond end of the first ARFR 10. The first inductive element L1 and thesecond inductive element L2 have mutual coupling M between them asillustrated in FIG. 9. Further, the first inductive element L1 and thesecond inductive element L2 are negatively coupled to one another asillustrated in FIG. 9. The first compensating ARFR 16, the firstinductive element L1, and the second inductive element L2 at leastpartially compensate for the parallel capacitance CP (FIG. 1B) of thefirst ARFR 10. In general, in one embodiment of the RF circuitry 12, thefirst parallel capacitance compensation circuit 14 at least partiallycompensate for the parallel capacitance CP (FIG. 1B) of the first ARFR10.

The first compensating ARFR 16 is coupled between the first inductiveelement L1 and ground. Additionally, the first compensating ARFR 16 isfurther coupled between the second inductive element L2 and the ground.In general, in one embodiment of the first parallel capacitancecompensation circuit 14, the first parallel capacitance compensationcircuit 14 is a passive circuit, which includes no active components.

In one embodiment of the first inductive element L1 and the secondinductive element L2, an absolute value of a coefficient of couplingbetween the first inductive element L1 and the second inductive elementL2 is greater than zero. In an alternate embodiment of the firstinductive element L1 and the second inductive element L2, the absolutevalue of the coefficient of coupling between the first inductive elementL1 and the second inductive element L2 is greater than 0.1. In anadditional embodiment of the first inductive element L1 and the secondinductive element L2, the absolute value of the coefficient of couplingbetween the first inductive element L1 and the second inductive elementL2 is greater than 0.2.

In one embodiment of the first inductive element L1 and the secondinductive element L2, the absolute value of the coefficient of couplingbetween the first inductive element L1 and the second inductive elementL2 is less than 0.7. In an alternate embodiment of the first inductiveelement L1 and the second inductive element L2, the absolute value ofthe coefficient of coupling between the first inductive element L1 andthe second inductive element L2 is less than 0.6. In an additionalembodiment of the first inductive element L1 and the second inductiveelement L2, the absolute value of the coefficient of coupling betweenthe first inductive element L1 and the second inductive element L2 isless than 0.5. In another embodiment of the first inductive element L1and the second inductive element L2, the absolute value of thecoefficient of coupling between the first inductive element L1 and thesecond inductive element L2 is less than 0.4. In a further embodiment ofthe first inductive element L1 and the second inductive element L2, theabsolute value of the coefficient of coupling between the firstinductive element L1 and the second inductive element L2 is less than0.3.

In one embodiment of the first inductive element L1 and the secondinductive element L2, an inductance of the first inductive element L1 isessentially equal to an inductance of the second inductive element L2.In an alternate embodiment of the first inductive element L1 and thesecond inductive element L2, the inductance of the first inductiveelement L1 is not equal to the inductance of the second inductiveelement L2.

In one embodiment of the first parallel capacitance compensation circuit14, the first parallel capacitance compensation circuit 14 augments RFbandpass filtering behavior of the first ARFR 10. In one embodiment ofthe first parallel capacitance compensation circuit 14, the firstparallel capacitance compensation circuit 14 increases a ratio of theparallel resonant frequency F_(P) (FIG. 2B) to the series resonantfrequency F_(S) (FIG. 2B).

In one embodiment of the first parallel capacitance compensation circuit14 and the first ARFR 10, the first parallel capacitance compensationcircuit 14 and the first ARFR 10 function as an RF bandpass filteringelement, such that the parallel resonant frequency F_(P) (FIG. 2B) fallsoutside of a passband of the RF bandpass filtering element.

In one embodiment of the first parallel capacitance compensation circuit14 and the first ARFR 10, the first parallel capacitance compensationcircuit 14 is coupled across the first ARFR 10, such that the firstparallel capacitance compensation circuit 14 presents a positivereactance across the first ARFR 10. A magnitude of the positivereactance is inversely related to frequency. Since the parallelcapacitance CP (FIG. 1B) of the first ARFR 10 presents a negativereactance across the first ARFR 10, such that the negative reactance isinversely related to frequency, the positive reactance at leastpartially cancels the negative reactance, thereby at least partiallycompensating for the parallel capacitance CP (FIG. 1B) of the first ARFR10.

In one embodiment of the first ARFR 10 and the first compensating ARFR16, each of the first ARFR 10 and the first compensating ARFR 16 is aSAW RF resonator. In an alternate embodiment of the first ARFR 10 andthe first compensating ARFR 16, each of the first ARFR 10 and the firstcompensating ARFR 16 is a BAW RF resonator.

FIG. 10 shows the RF circuitry 12 according to a further embodiment ofthe RF circuitry 12. The RF circuitry 12 illustrated in FIG. 10 issimilar to the RF circuitry 12 illustrated in FIG. 9, except in the RFcircuitry 12 illustrated in FIG. 10, there is no intended mutualcoupling M (FIG. 9) between the first inductive element L1 and thesecond inductive element L2. As such, the absolute value of thecoefficient of coupling between the first inductive element L1 and thesecond inductive element L2 is essentially equal to zero.

FIG. 11A shows the first ARFR 10 and the load resistive element RLaccording to the prior art. The first ARFR 10 and the load resistiveelement RL illustrated in FIG. 11A are similar to the first ARFR 10 andthe load resistive element RL illustrated in FIG. 1A.

FIG. 11B shows the first ARFR 10, the load resistive element RL, and thefirst parallel capacitance compensation circuit 14 according to oneembodiment of the first ARFR 10, the load resistive element RL, and thefirst parallel capacitance compensation circuit 14. The first ARFR 10and the load resistive element RL illustrated in FIG. 11B is similar tothe first ARFR 10 and the load resistive element RL illustrated in FIG.1A, except in FIG. 11B, the first parallel capacitance compensationcircuit 14 is coupled across the first ARFR 10.

The first parallel capacitance compensation circuit 14 illustrated inFIG. 11B may include any of the embodiments of the first parallelcapacitance compensation circuit 14 illustrated in FIGS. 3, 4, 5, 6, 7,8, 9, 10, or any combination thereof.

FIG. 12A is a graph illustrating a magnitude of the RF output signal RFTillustrated in FIG. 11A according to the prior art. The magnitude of theRF output signal RFT is shown versus frequency of the RF output signalRFT. A preferred passband is illustrated. The RF output signal RFTillustrated in FIG. 12A has insufficient bandwidth to support thepreferred passband. Additionally, an out of band magnitude of the RFoutput signal RFT increases as the frequency of the RF output signal RFTincreases due to the parallel capacitance CP (FIG. 1B). As such, thefirst ARFR 10 and the load resistive element RL illustrated in FIG. 11Ado not provide good out of band rejection of the RF output signal RFT.

FIG. 12B is a graph illustrating a magnitude of the RF output signal RFTillustrated in FIG. 11B according to one embodiment of the first ARFR10, the load resistive element RL, and the first parallel capacitancecompensation circuit 14. By adding the first parallel capacitancecompensation circuit 14, the first parallel capacitance compensationcircuit 14 at least partially compensates for the parallel capacitanceCP (FIG. 1B).

As a result, the RF output signal RFT has adequate bandwidth to supportthe preferred passband. Also, while the out of band magnitude of the RFoutput signal RFT illustrated in FIG. 12B increases as the frequency ofthe RF output signal RFT increases, the out of band magnitude of the RFoutput signal RFT illustrated in FIG. 12B is significantly less than theout of band magnitude of the RF output signal RFT illustrated in FIG.12A.

FIG. 13 shows the RF circuitry 12 according to one embodiment of the RFcircuitry 12. The RF circuitry 12 includes RF system control circuitry24, RF front-end circuitry 26, and a first RF antenna 28. The RFfront-end circuitry 26 includes an RF TX/RX multiplexer 30, RF receivecircuitry 32, and RF transmit circuitry 34. The RF TX/RX multiplexer 30has a first common connection node CN1, which is coupled to the first RFantenna 28. In one embodiment of the RF TX/RX multiplexer 30, the firstcommon connection node CN1 is directly coupled to the first RF antenna28. The RF system control circuitry 24 provides a first functionconfiguration signal FCS1 to the RF front-end circuitry 26. As such, inone embodiment of the RF front-end circuitry 26, the RF system controlcircuitry 24 configures any or all of the RF TX/RX multiplexer 30, theRF receive circuitry 32, and the RF transmit circuitry 34 using thefirst function configuration signal FCS1.

In one embodiment of the RF system control circuitry 24, the RF systemcontrol circuitry 24 provides a first antenna, first upstream RFtransmit signal T1U1, a first antenna, second upstream RF transmitsignal T1U2, and up to and including a first antenna, M^(TH) upstream RFtransmit signal T1UM to the RF transmit circuitry 34. In general, the RFsystem control circuitry 24 provides a group of first antenna, upstreamRF transmit signals T1U1, T1U2, T1UM to the RF transmit circuitry 34.

The RF transmit circuitry 34 processes the first antenna, first upstreamRF transmit signal T1U1 to provide a first antenna, first downstream RFtransmit signal T1D1 to the RF TX/RX multiplexer 30, the first antenna,second upstream RF transmit signal T1U2 to provide a first antenna,second downstream RF transmit signal T1D2 to the RF TX/RX multiplexer30, and up to and including the first antenna, M^(TH) upstream RFtransmit signal T1UM to provide a first antenna, M^(TH) downstream RFtransmit signal T1DM to the RF TX/RX multiplexer 30. In general, the RFtransmit circuitry 34 provides a group of first antenna, downstream RFtransmit signals T1D1, T1D2, T1DM to the RF TX/RX multiplexer 30.

In one embodiment of the RF system control circuitry 24, the RF systemcontrol circuitry 24 provides at least one of the group of firstantenna, upstream RF transmit signals T1U1, T1U2, T1UM to the RFtransmit circuitry 34, which processes and forwards any or all of thegroup of first antenna, upstream RF transmit signals T1U1, T1U2, T1UM toprovide a corresponding any or all of the group of first antenna,downstream RF transmit signals T1D1, T1D2, T1DM to the RF TX/RXmultiplexer 30. The RF TX/RX multiplexer 30 receives, bandpass filters,and forwards the corresponding any or all of the group of first antenna,downstream RF transmit signals T1D1, T1D2, T1DM to provide acorresponding any or all of a first antenna, first RF antenna transmitsignal T1A1, a first antenna, second RF antenna transmit signal T1A2,and up to and including a first antenna, M^(TH) RF antenna transmitsignal T1AM to the first RF antenna 28 via the first common connectionnode CN1.

The RF transmit circuitry 34 may include up-conversion circuitry,amplification circuitry, power supply circuitry, filtering circuitry,switching circuitry, combining circuitry, splitting circuitry, dividingcircuitry, clocking circuitry, the like, or any combination thereof toprocess any or all of the group of first antenna, upstream RF transmitsignals T1U1, T1U2, T1UM. In one embodiment of the RF transmit circuitry34, the RF transmit circuitry 34 includes circuitry to reduceinterference of RF receive signals in the RF TX/RX multiplexer 30 byprocessing the group of first antenna, downstream RF transmit signalsT1D1, T1D2, T1DM in the RF TX/RX multiplexer 30.

In one embodiment of the RF TX/RX multiplexer 30, the RF TX/RXmultiplexer 30 receives any or all of a first antenna, first RF receivesignal R1A1; a first antenna, second RF receive signal R1A2; and up toand including a first antenna, N^(TH) RF receive signal R1AN; which arereceived via the first RF antenna 28. In general, the RF TX/RXmultiplexer 30 receives any or all of a group of first antenna, RFreceive signals R1A1, R1A2, R1AN from the first common connection nodeCN1. In one embodiment of the group of first antenna, RF receive signalsR1A1, R1A2, R1AN, any or all of the group of first antenna, RF receivesignals R1A1, R1A2, R1AN are received simultaneously, such that the RFTX/RX multiplexer 30 supports receive downlink carrier aggregation(RXDLCA).

The RF TX/RX multiplexer 30 processes and forwards any or all of thegroup of first antenna, RF receive signals R1A1, R1A2, R1AN from thefirst common connection node CN1 to provide any or all of a firstantenna, first upstream RF receive signal R1U1, a first antenna, secondupstream RF receive signal R1U2, and up to and including a firstantenna, N^(TH) upstream RF receive signal R1UN. In general, the RFTX/RX multiplexer 30 provides any or all of a group of first antenna,upstream RF receive signals R1U1, R1U2, R1UN to the RF receive circuitry32.

In one embodiment of the RF receive circuitry 32, the RF receivecircuitry 32 receives and processes any or all of the group of the firstantenna, upstream RF receive signals R1U1, R1U2, R1UN to provide acorresponding any or all of a group of first antenna, downstream RFreceive signals R1D1, R1D2, R1DN.

In an additional embodiment of the RF receive circuitry 32, the RFreceive circuitry 32 simultaneously receives and processes any or all ofthe group of first antenna, upstream RF receive signals R1U1, R1U2,R1UN. As such, the RF receive circuitry 32 supports RXDLCA. The RFreceive circuitry 32 may include down-conversion circuitry,amplification circuitry, low noise amplification circuitry, power supplycircuitry, filtering circuitry, switching circuitry, combiningcircuitry, splitting circuitry, dividing circuitry, clocking circuitry,the like, or any combination thereof.

In one embodiment of the RF front-end circuitry 26, any or all of thegroup of first antenna, RF receive signals R1A1, R1A2, R1AN, any or allof the group of first antenna, RF antenna transmit signals T1A1, T1A2,T1AM, any or all of the group of first antenna, upstream RF receivesignals R1U1, R1U2, R1UN, any or all of the group of first antenna,downstream RF receive signals R1D1, R1D2, R1DN, any or all of the groupof upstream RF transmit signals T1U1, T1U2, T1UM, and any or all of thegroup of downstream RF transmit signals T1D1, T1D2, T1DM are omitted.

In one embodiment of the RF system control circuitry 24, the RF systemcontrol circuitry 24 provides the first function configuration signalFCS1 to the RF TX/RX multiplexer 30, the RF receive circuitry 32, andthe RF transmit circuitry 34. As such, the RF system control circuitry24 may configure, tune, adjust, enable, disable, vary, or anycombination thereof, circuits within the RF TX/RX multiplexer 30, the RFreceive circuitry 32, the RF transmit circuitry 34, or any combinationthereof, as necessary, using the first function configuration signalFCS1.

FIG. 14 shows the RF circuitry 12 according to an alternate embodimentof the RF circuitry 12. The RF circuitry 12 illustrated in FIG. 14 issimilar to the RF circuitry 12 illustrated in FIG. 13, except the RFcircuitry 12 illustrated in FIG. 14 further includes a second RF antenna36. Additionally, the RF TX/RX multiplexer 30 further has a secondcommon connection node CN2, which is coupled to the second RF antenna36.

In one embodiment of the RF system control circuitry 24, the RF systemcontrol circuitry 24 further provides a second antenna, first upstreamRF transmit signal T2U1, a second antenna, second upstream RF transmitsignal T2U2, and up to and including a second antenna, T^(TH) upstreamRF transmit signal T2UT to the RF transmit circuitry 34. In general, theRF system control circuitry 24 provides the group of first antenna,upstream RF transmit signals T1U1, T1U2, T1UM and a group of secondantenna, upstream RF transmit signals T2U1, T2U2, T2UT to the RFtransmit circuitry 34.

The RF transmit circuitry 34 further processes the second antenna, firstupstream RF transmit signal T2U1 to provide a second antenna, firstdownstream RF transmit signal T2D1 to the RF TX/RX multiplexer 30, thesecond antenna, second upstream RF transmit signal T2U2 to provide asecond antenna, second downstream RF transmit signal T2D2 to the RFTX/RX multiplexer 30, and up to and including the second antenna, T^(TH)upstream RF transmit signal T2UT to provide a second antenna, T^(TH)downstream RF transmit signal T2DT to the RF TX/RX multiplexer 30. Ingeneral, the RF transmit circuitry 34 provides the group of firstantenna, downstream RF transmit signals T1D1, T1D2, T1DM to the RF TX/RXmultiplexer 30 and further provides a group of second antenna,downstream RF transmit signals T2D1, T2D2, T2DT to the RF TX/RXmultiplexer 30.

In one embodiment of the RF system control circuitry 24, the RF systemcontrol circuitry 24 further provides at least one of the group ofsecond antenna, upstream RF transmit signals T2U1, T2U2, T2UT to the RFtransmit circuitry 34, which processes and forwards any or all of thegroup of second antenna, upstream RF transmit signals T2U1, T2U2, T2UTto provide a corresponding any or all of the group of second antenna,downstream RF transmit signals T2D1, T2D2, T2DT to the RF TX/RXmultiplexer 30. The RF TX/RX multiplexer 30 receives, bandpass filters,and forwards the corresponding any or all of the group of secondantenna, downstream RF transmit signals T2D1, T2D2, T2DT to provide acorresponding any or all of a second antenna, first RF antenna transmitsignal T2A1; a second antenna, second RF antenna transmit signal T2A2;and up to and including a second antenna, T^(TH) RF antenna transmitsignal T2AT to the second RF antenna 36 via the second common connectionnode CN2.

The RF transmit circuitry 34 may include up-conversion circuitry,amplification circuitry, power supply circuitry, filtering circuitry,switching circuitry, combining circuitry, splitting circuitry, dividingcircuitry, clocking circuitry, the like, or any combination thereof toprocess any or all of the group of first antenna, upstream RF transmitsignals T1U1, T1U2, T1UM and the group of second antenna, upstream RFtransmit signals T2U1, T2U2, T2UT. In one embodiment of the RF transmitcircuitry 34, the RF transmit circuitry 34 includes circuitry to reduceinterference of RF receive signals in the RF TX/RX multiplexer 30 byprocessing the group of first antenna, downstream RF transmit signalsT1D1, T1D2, T1DM and the group of second antenna, downstream RF transmitsignals T2D1, T2D2, T2DT in the RF TX/RX multiplexer 30.

In one embodiment of the RF TX/RX multiplexer 30, the RF TX/RXmultiplexer 30 further receives any or all of a second antenna, first RFreceive signal R2A1; a second antenna, second RF receive signal R2A2;and up to and including a second antenna, P^(TH) RF receive signal R2AP;which are received via the second RF antenna 36. In general, the RFTX/RX multiplexer 30 further receives any or all of a group of secondantenna, RF receive signals R2A1, R2A2, R2AP from the second commonconnection node CN2. In one embodiment of the group of first antenna, RFreceive signals R1A1, R1A2, R1AN and the group of second antenna, RFreceive signals R2A1, R2A2, R2AP, any or all of the group of firstantenna, RF receive signals R1A1, R1A2, R1AN and the group of secondantenna, RF receive signals R2A1, R2A2, R2AP are receivedsimultaneously, such that the RF TX/RX multiplexer 30 supports receivedownlink carrier aggregation (RXDLCA).

The RF TX/RX multiplexer 30 processes and forwards any or all of thegroup of second antenna, RF receive signals R2A1, R2A2, R1AP from thesecond common connection node CN2 to provide any or all of a secondantenna, first upstream RF receive signal R2U1, a second antenna, secondupstream RF receive signal R2U2, and up to and including a secondantenna, P^(TH) upstream RF receive signal R2UP. In general, the RFTX/RX multiplexer 30 provides any or all of the group of first antenna,upstream RF receive signals R1U1, R1U2, R1UN and the group of secondantenna, upstream RF receive signals R2U1, R2U2, R2UP to the RF receivecircuitry 32.

In one embodiment of the RF receive circuitry 32, the RF receivecircuitry 32 receives and processes any or all of the group of the firstantenna, upstream RF receive signals R1U1, R1U2, R1UN and the group ofsecond antenna, upstream RF receive signals R2U1, R2U2, R2UP to providea corresponding any or all of the group of first antenna, downstream RFreceive signals R1D1, R1D2, R1DN and a group of second antenna,downstream RF receive signals R2D1, R2D2, R2DP.

In an additional embodiment of the RF receive circuitry 32, the RFreceive circuitry 32 simultaneously receives and processes any or all ofthe group of first antenna, upstream RF receive signals R1U1, R1U2, R1UNand the group of second antenna, upstream RF receive signals R2U1, R2U2,R2UP. As such, the RF receive circuitry 32 supports RXDLCA. The RFreceive circuitry 32 may include down-conversion circuitry,amplification circuitry, low noise amplification circuitry, power supplycircuitry, filtering circuitry, switching circuitry, combiningcircuitry, splitting circuitry, dividing circuitry, clocking circuitry,the like, or any combination thereof.

In one embodiment of the RF front-end circuitry 26, any or all of thegroup of first antenna, RF receive signals R1A1, R1A2, R1AN, any or allof the group of second antenna, RF receive signals R2A1, R2A2, R1AP, anyor all of the group of first antenna, RF antenna transmit signals T1A1,T1A2, T1AM, any or all of the group of second antenna, RF antennatransmit signals T2A1, T2A2, T2AT, any or all of the group of firstantenna, upstream RF receive signals R1U1, R1U2, R1UN, any or all of thegroup of second antenna, upstream RF receive signals R2U1, R2U2, R2UP,any or all of the group of first antenna, downstream RF receive signalsR1D1, R1D2, R1DN, any or all of the group of second antenna, downstreamRF receive signals R2D1, R2D2, R2DP, any or all of the group of firstantenna, upstream RF transmit signals T1U1, T1U2, T1UM, any or all ofthe group of second antenna, upstream RF transmit signals T2U1, T2U2,T2UT, any or all of the group of first antenna, downstream RF transmitsignals T1D1, T1D2, T1DM, and any or all of the group of second antenna,downstream RF transmit signals T2D1, T2D2, T2DT are omitted.

FIG. 15 shows details of the RF TX/RX multiplexer 30 illustrated in FIG.13 according to one embodiment of the RF TX/RX multiplexer 30. The RFTX/RX multiplexer 30 includes a first antenna, first RF RX bandpassfilter 38, a first antenna, second RF RX bandpass filter 40, and up toand including a first antenna, N^(TH) RF RX bandpass filter 42, a firstantenna, first RF TX bandpass filter 44, a first antenna, second RF TXbandpass filter 46, and up to and including a first antenna, M^(TH) RFTX bandpass filter 48. Each of the first antenna, RF bandpass filters38, 40, 42, 44, 46, 48 illustrated in FIG. 15 is coupled to the firstcommon connection node CN1.

In one embodiment of the first antenna, RF RX bandpass filters 38, 40,42, each of the first antenna, RF RX bandpass filters 38, 40, 42 has acorresponding passband that is associated with a corresponding RFreceive communications band. In one embodiment of the first antenna, RFTX bandpass filters 44, 46, 48, each of the first antenna, RF TXbandpass filters 44, 46, 48 has a corresponding passband that isassociated with a corresponding RF transmit communications band. In oneembodiment of the RF TX/RX multiplexer 30, any or all of the firstantenna, RF bandpass filters 38, 40, 42, 44, 46, 48 is omitted.

In one embodiment of the first antenna, first RF RX bandpass filter 38,the first antenna, first RF RX bandpass filter 38 receives and filtersthe first antenna, first RF receive signal R1A1 (FIG. 13) via the firstRF antenna 28 (FIG. 13) and the first common connection node CN1 toprovide the first antenna, first upstream RF receive signal R1U1. In oneembodiment of the first antenna, second RF RX bandpass filter 40, thefirst antenna, second RF RX bandpass filter 40 receives and filters thefirst antenna, second RF receive signal R1A2 (FIG. 13) via the first RFantenna 28 (FIG. 13) and the first common connection node CN1 to providethe first antenna, second upstream RF receive signal R1U2. In oneembodiment of the first antenna, N^(TH) RF RX bandpass filter 42, thefirst antenna, N^(TH) RF RX bandpass filter 42 receives and filters thefirst antenna, N^(TH) RF receive signal ALAN (FIG. 13) via the first RFantenna 28 (FIG. 13) and the first common connection node CN1 to providethe first antenna, N^(TH) upstream RF receive signal R1UN.

In one embodiment of the first antenna, first RF TX bandpass filter 44,the first antenna, first RF TX bandpass filter 44 receives and filtersthe first antenna, first downstream RF transmit signal T1D1 to providethe first antenna, first RF antenna transmit signal T1A1 (FIG. 13) viafirst common connection node CN1 and the first RF antenna 28 (FIG. 13).In one embodiment of the first antenna, second RF TX bandpass filter 46,the first antenna, second RF TX bandpass filter 46 receives and filtersthe first antenna, second downstream RF transmit signal T1D2 to providethe first antenna, second RF antenna transmit signal T1A2 (FIG. 13) viafirst common connection node CN1 and the first RF antenna 28 (FIG. 13).In one embodiment of the first antenna, M^(TH) RF TX bandpass filter 48,the first antenna, M^(TH) RF TX bandpass filter 48 receives and filtersthe first antenna, M^(TH) downstream RF transmit signal T1DM to providethe first antenna, M^(TH) RF antenna transmit signal T1AM (FIG. 13) viafirst common connection node CN1 and the first RF antenna 28 (FIG. 13).

FIG. 16 shows details of the RF TX/RX multiplexer 30 illustrated in FIG.14 according to an alternate embodiment of the RF TX/RX multiplexer 30.The RF TX/RX multiplexer 30 illustrated in FIG. 16 is similar to the RFTX/RX multiplexer 30 illustrated in FIG. 15 further includes a secondantenna, first RF RX bandpass filter 50, a second antenna, second RF RXbandpass filter 52, a second antenna, P^(TH) RF RX bandpass filter 54, asecond antenna, first RF TX bandpass filter 56, a second antenna, secondRF TX bandpass filter 58, and a second antenna, T^(TH) RF TX bandpassfilter 60.

Each of the first antenna, RF bandpass filters 38, 40, 42, 44, 46, 48illustrated in FIG. 16 is coupled to the first common connection nodeCN1 and each of the second antenna, RF bandpass filters 50, 52, 54, 56,58, 60 illustrated in FIG. 16 is coupled to the second common connectionnode CN2.

In one embodiment of the second antenna, RF RX bandpass filters 50, 52,54, each of the second antenna, RF RX bandpass filters 50, 52, 54 has acorresponding passband that is associated with a corresponding RFreceive communications band. In one embodiment of the second antenna, RFTX bandpass filters 56, 58, 60, each of the second antenna, RF TXbandpass filters 56, 58, 60 has a corresponding passband that isassociated with a corresponding RF transmit communications band. In oneembodiment of the RF TX/RX multiplexer 30, any or all of the secondantenna, RF bandpass filters 50, 52, 54, 56, 58, 60 is omitted.

In one embodiment of the second antenna, first RF RX bandpass filter 50,the second antenna, first RF RX bandpass filter 50 receives and filtersthe second antenna, first RF receive signal R2A1 (FIG. 14) via thesecond RF antenna 36 (FIG. 14) and the second common connection node CN2to provide the second antenna, first upstream RF receive signal R2U1. Inone embodiment of the second antenna, second RF RX bandpass filter 52,the second antenna, second RF RX bandpass filter 52 receives and filtersthe second antenna, second RF receive signal R2A2 (FIG. 14) via thesecond RF antenna 36 (FIG. 14) and the second common connection node CN2to provide the second antenna, second upstream RF receive signal R2U2.In one embodiment of the second antenna, P^(TH) RF RX bandpass filter54, the second antenna, P^(TH) RF RX bandpass filter 54 receives andfilters the second antenna, P^(TH) RF receive signal R2AP (FIG. 14) viathe second RF antenna 36 (FIG. 14) and the second common connection nodeCN2 to provide the second antenna, P^(TH) upstream RF receive signalR2UP.

In one embodiment of the second antenna, first RF TX bandpass filter 56,the second antenna, first RF TX bandpass filter 56 receives and filtersthe second antenna, first downstream RF transmit signal T2D1 to providethe second antenna, first RF antenna transmit signal T2A1 (FIG. 14) viasecond common connection node CN2 and the second RF antenna 36 (FIG.14). In one embodiment of the second antenna, second RF TX bandpassfilter 58, the second antenna, second RF TX bandpass filter 58 receivesand filters the second antenna, second downstream RF transmit signalT2D2 to provide the second antenna, second RF antenna transmit signalT2A2 (FIG. 14) via second common connection node CN2 and the second RFantenna 36 (FIG. 13). In one embodiment of the second antenna, T^(TH) RFTX bandpass filter 60, the second antenna, T^(TH) RF TX bandpass filter60 receives and filters the second antenna, T^(TH) downstream RFtransmit signal T2DT to provide the second antenna, T^(TH) RF antennatransmit signal T2AT (FIG. 14) via second common connection node CN2 andthe second RF antenna 36 (FIG. 14).

FIG. 17A shows details of the first antenna, first RF RX bandpass filter38 illustrated in FIG. 15 according to one embodiment of the firstantenna, first RF RX bandpass filter 38. The first antenna, first RF RXbandpass filter 38 includes the first ARFR 10, the first parallelcapacitance compensation circuit 14, a first group 62 of series-coupledARFRs 64, and a first group 66 of shunt-coupled ARFRs 68. The firstparallel capacitance compensation circuit 14 is coupled across the firstARFR 10.

The series-coupled ARFRs 64 of the first group 62 of series-coupledARFRs 64 are coupled in series between the first ARFR 10 and the firstRF antenna 28 (FIG. 13) via the first common connection node CN1. In oneembodiment of the first group 66 of shunt-coupled ARFRs 68, eachshunt-coupled ARFR 68 of the first group 66 of shunt-coupled ARFRs 68 iscoupled between a corresponding pair of the first group 62 ofseries-coupled ARFRs 64 and ground. The first antenna, first RF RXbandpass filter 38 receives and filters the first antenna, first RFreceive signal R1A1 (FIG. 15) via the first RF antenna 28 (FIG. 13) andthe first common connection node CN1 to provide the first antenna, firstupstream RF receive signal R1U1 via the first ARFR 10.

In one embodiment of the first parallel capacitance compensation circuit14, the first parallel capacitance compensation circuit 14 is the firstparallel capacitance compensation circuit 14 illustrated in FIG. 3, suchthat the first parallel capacitance compensation circuit 14 includes thefirst compensating ARFR 16 (FIG. 3), the second compensating ARFR 18(FIG. 3), the first inductive element L1 (FIG. 3), and the secondinductive element L2 (FIG. 3).

In an alternate embodiment of the first parallel capacitancecompensation circuit 14, the first parallel capacitance compensationcircuit 14 is the first parallel capacitance compensation circuit 14illustrated in FIG. 4, such that the first parallel capacitancecompensation circuit 14 includes the first compensating ARFR 16 (FIG.4), the first inductive element L1 (FIG. 4), the second inductiveelement L2 (FIG. 4), and the capacitance circuit 20 (FIG. 4).

In an additional embodiment of the first parallel capacitancecompensation circuit 14, the first parallel capacitance compensationcircuit 14 is the first parallel capacitance compensation circuit 14illustrated in FIG. 9, such that the first parallel capacitancecompensation circuit 14 includes the first compensating ARFR 16 (FIG.9), the first inductive element L1 (FIG. 9), and the second inductiveelement L2 (FIG. 9).

In another embodiment of the first parallel capacitance compensationcircuit 14, the first parallel capacitance compensation circuit 14 isthe first parallel capacitance compensation circuit 14 illustrated inFIG. 10, such that the first parallel capacitance compensation circuit14 includes the first compensating ARFR 16 (FIG. 10), the firstinductive element L1 (FIG. 10), and the second inductive element L2(FIG. 10).

FIG. 17B shows details of the first antenna, second RF RX bandpassfilter 40 illustrated in FIG. 15 according to one embodiment of thefirst antenna, second RF RX bandpass filter 40. The first antenna,second RF RX bandpass filter 40 includes a second ARFR 70, a secondparallel capacitance compensation circuit 72, a second group 74 ofseries-coupled ARFRs 64, and a second group 76 of shunt-coupled ARFRs68. The first parallel capacitance compensation circuit 72 is coupledacross the second ARFR 70. In one embodiment of the second ARFR 70, thesecond ARFR 70 is similar to the first ARFR 10 illustrated in FIG. 17A.In one embodiment of the second parallel capacitance compensationcircuit 72, the second parallel capacitance compensation circuit 72 issimilar to the first parallel capacitance compensation circuit 14illustrated in FIG. 17A.

The series-coupled ARFRs 64 of the second group 74 of series-coupledARFRs 64 are coupled in series between the second ARFR 70 and the firstRF antenna 28 (FIG. 13) via the first common connection node CN1. In oneembodiment of the second group 76 of shunt-coupled ARFRs 68, eachshunt-coupled ARFR 68 of the second group 76 of shunt-coupled ARFRs 68is coupled between a corresponding pair of the second group 74 ofseries-coupled ARFRs 64 and ground. The first antenna, second RF RXbandpass filter 40 receives and filters the first antenna, second RFreceive signal R1 A2 (FIG. 15) via the first RF antenna 28 (FIG. 13) andthe first common connection node CN1 to provide the first antenna,second upstream RF receive signal R1 U2 via the first ARFR 10.

In one embodiment of the second parallel capacitance compensationcircuit 72, the second parallel capacitance compensation circuit 72 issimilar to the first parallel capacitance compensation circuit 14illustrated in FIG. 3. In an alternate embodiment of the second parallelcapacitance compensation circuit 72, the second parallel capacitancecompensation circuit 72 is similar to the first parallel capacitancecompensation circuit 14 illustrated in FIG. 4. In an additionalembodiment of the second parallel capacitance compensation circuit 72,the second parallel capacitance compensation circuit 72 is similar tothe first parallel capacitance compensation circuit 14 illustrated inFIG. 9. In another embodiment of the second parallel capacitancecompensation circuit 72, the first parallel capacitance compensationcircuit 14 is similar to the first parallel capacitance compensationcircuit 14 illustrated in FIG. 10.

FIG. 18A shows details of the first antenna, first RF RX bandpass filter38 illustrated in FIG. 15 according to one embodiment of the firstantenna, first RF RX bandpass filter 38. The first antenna, first RF RXbandpass filter 38 illustrated in FIG. 18A is similar to the firstantenna, first RF RX bandpass filter 38 illustrated in FIG. 17A.

FIG. 18B shows details of the first antenna, first RF TX bandpass filter44 illustrated in FIG. 15 according to one embodiment of the firstantenna, first RF TX bandpass filter 44. The first antenna, first RF TXbandpass filter 44 includes the second ARFR 70, the second parallelcapacitance compensation circuit 72, the second group 74 ofseries-coupled ARFRs 64, and the second group 76 of shunt-coupled ARFRs68. The second parallel capacitance compensation circuit 72 is coupledacross the second ARFR 70. In one embodiment of the second ARFR 70, thesecond ARFR 70 is similar to the first ARFR 10 illustrated in FIG. 18A.In one embodiment of the second parallel capacitance compensationcircuit 72, the second parallel capacitance compensation circuit 72 issimilar to the first parallel capacitance compensation circuit 14illustrated in FIG. 18A.

The series-coupled ARFRs 64 of the second group 74 of series-coupledARFRs 64 are coupled in series between the second ARFR 70 and the firstRF antenna 28 (FIG. 13) via the first common connection node CN1. In oneembodiment of the second group 76 of shunt-coupled ARFRs 68, eachshunt-coupled ARFR 68 of the second group 76 of shunt-coupled ARFRs 68is coupled between a corresponding pair of the second group 74 ofseries-coupled ARFRs 64 and ground.

The first antenna, first RF TX bandpass filter 44 receives and filtersthe first antenna, first downstream RF transmit signal T1 D1 via thesecond ARFR 70 to provide the first antenna, first RF antenna transmitsignal T1A1 (FIG. 13) via the first common connection node CN1 and thefirst RF antenna 28 (FIG. 13).

In one embodiment of the second parallel capacitance compensationcircuit 72, the second parallel capacitance compensation circuit 72 issimilar to the first parallel capacitance compensation circuit 14illustrated in FIG. 3. In an alternate embodiment of the second parallelcapacitance compensation circuit 72, the second parallel capacitancecompensation circuit 72 is similar to the first parallel capacitancecompensation circuit 14 illustrated in FIG. 4. In an additionalembodiment of the second parallel capacitance compensation circuit 72,the second parallel capacitance compensation circuit 72 is similar tothe first parallel capacitance compensation circuit 14 illustrated inFIG. 9. In another embodiment of the second parallel capacitancecompensation circuit 72, the first parallel capacitance compensationcircuit 14 is similar to the first parallel capacitance compensationcircuit 14 illustrated in FIG. 10.

FIG. 19A shows details of the first antenna, first RF RX bandpass filter38 illustrated in FIG. 15 according to one embodiment of the firstantenna, first RF RX bandpass filter 38. The first antenna, first RF RXbandpass filter 38 illustrated in FIG. 19A is similar to the firstantenna, first RF RX bandpass filter 38 illustrated in FIG. 17A.

FIG. 19B shows details of the second antenna, first RF RX bandpassfilter 50 illustrated in FIG. 16 according to one embodiment of thesecond antenna, first RF RX bandpass filter 50. The second antenna,first RF RX bandpass filter 50 includes the second ARFR 70, the secondparallel capacitance compensation circuit 72, the second group 74 ofseries-coupled ARFRs 64, and the second group 76 of shunt-coupled ARFRs68. The second parallel capacitance compensation circuit 72 is coupledacross the second ARFR 70. In one embodiment of the second ARFR 70, thesecond ARFR 70 is similar to the first ARFR 10 illustrated in FIG. 19A.

The series-coupled ARFRs 64 of the second group 74 of series-coupledARFRs 64 are coupled in series between the second ARFR 70 and the secondRF antenna 36 (FIG. 14) via the second common connection node CN2. Inone embodiment of the second group 76 of shunt-coupled ARFRs 68, eachshunt-coupled ARFR 68 of the second group 76 of shunt-coupled ARFRs 68is coupled between a corresponding pair of the second group 74 ofseries-coupled ARFRs 64 and ground.

The second antenna, first RF RX bandpass filter 50 receives and filtersthe second antenna, first RF antenna receive signal R2A1 via the secondRF antenna 36 (FIG. 14) and the second common connection node CN2 toprovide the second antenna, first upstream RF receive signal R2U1.

In one embodiment of the second parallel capacitance compensationcircuit 72, the second parallel capacitance compensation circuit 72 issimilar to the first parallel capacitance compensation circuit 14illustrated in FIG. 3. In an alternate embodiment of the second parallelcapacitance compensation circuit 72, the second parallel capacitancecompensation circuit 72 is similar to the first parallel capacitancecompensation circuit 14 illustrated in FIG. 4. In an additionalembodiment of the second parallel capacitance compensation circuit 72,the second parallel capacitance compensation circuit 72 is similar tothe first parallel capacitance compensation circuit 14 illustrated inFIG. 9. In another embodiment of the second parallel capacitancecompensation circuit 72, the first parallel capacitance compensationcircuit 14 is similar to the first parallel capacitance compensationcircuit 14 illustrated in FIG. 10.

In one embodiment of the second parallel capacitance compensationcircuit 72, the second parallel capacitance compensation circuit 72 issimilar to the first parallel capacitance compensation circuit 14illustrated in FIG. 3. In an alternate embodiment of the second parallelcapacitance compensation circuit 72, the second parallel capacitancecompensation circuit 72 is similar to the first parallel capacitancecompensation circuit 14 illustrated in FIG. 4. In an additionalembodiment of the second parallel capacitance compensation circuit 72,the second parallel capacitance compensation circuit 72 is similar tothe first parallel capacitance compensation circuit 14 illustrated inFIG. 9. In another embodiment of the second parallel capacitancecompensation circuit 72, the first parallel capacitance compensationcircuit 14 is similar to the first parallel capacitance compensationcircuit 14 illustrated in FIG. 10.

FIG. 20A shows details of the first antenna, first RF TX bandpass filter44 illustrated in FIG. 15 according to one embodiment of the firstantenna, first RF TX bandpass filter 44. The first antenna, first RF TXbandpass filter 44 illustrated in FIG. 20A is similar to the firstantenna, first RF RX bandpass filter 38 illustrated in FIG. 19A.However, the first antenna, first RF TX bandpass filter 44 receives andfilters the first antenna, first downstream RF transmit signal T1D1 viathe first ARFR 10 to provide the first antenna, first RF antennatransmit signal T1A1 (FIG. 13) via the first common connection node CN1and the first RF antenna 28 (FIG. 13).

FIG. 20B shows details of the first antenna, second RF TX bandpassfilter 46 illustrated in FIG. 15 according to one embodiment of thefirst antenna, second RF TX bandpass filter 46. The first antenna,second RF TX bandpass filter 46 includes the second ARFR 70, the secondparallel capacitance compensation circuit 72, the second group 74 ofseries-coupled ARFRs 64, and the second group 76 of shunt-coupled ARFRs68. The second parallel capacitance compensation circuit 72 is coupledacross the second ARFR 70. In one embodiment of the second ARFR 70, thesecond ARFR 70 is similar to the first ARFR 10 illustrated in FIG. 18A.In one embodiment of the second parallel capacitance compensationcircuit 72, the second parallel capacitance compensation circuit 72 issimilar to the first parallel capacitance compensation circuit 14illustrated in FIG. 18A.

The series-coupled ARFRs 64 of the second group 74 of series-coupledARFRs 64 are coupled in series between the second ARFR 70 and the firstRF antenna 28 (FIG. 13) via the first common connection node CN1. In oneembodiment of the second group 76 of shunt-coupled ARFRs 68, eachshunt-coupled ARFR 68 of the second group 76 of shunt-coupled ARFRs 68is coupled between a corresponding pair of the second group 74 ofseries-coupled ARFRs 64 and ground.

The first antenna, second RF TX bandpass filter 46 receives and filtersthe first antenna, second downstream RF transmit signal T1D2 via thesecond ARFR 70 to provide the first antenna, second RF antenna transmitsignal T1A2 (FIG. 13) via the first common connection node CN1 and thefirst RF antenna (FIG. 13).

In one embodiment of the second parallel capacitance compensationcircuit 72, the second parallel capacitance compensation circuit 72 issimilar to the first parallel capacitance compensation circuit 14illustrated in FIG. 3. In an alternate embodiment of the second parallelcapacitance compensation circuit 72, the second parallel capacitancecompensation circuit 72 is similar to the first parallel capacitancecompensation circuit 14 illustrated in FIG. 4. In an additionalembodiment of the second parallel capacitance compensation circuit 72,the second parallel capacitance compensation circuit 72 is similar tothe first parallel capacitance compensation circuit 14 illustrated inFIG. 9. In another embodiment of the second parallel capacitancecompensation circuit 72, the second parallel capacitance compensationcircuit 72 is similar to the first parallel capacitance compensationcircuit 14 illustrated in FIG. 10.

FIG. 21A shows a portion of the RF circuitry 12 according to oneembodiment of the RF circuitry 12. The RF circuitry 12 includes anacoustic substrate 78, which includes portions of the first antenna,first RF RX bandpass filter 38 illustrated in FIG. 17A. The acousticsubstrate 78 includes the first ARFR 10, the first compensating ARFR 16,the second compensating ARFR 18, the first group 62 of series-coupledARFRs 64, and the first group 66 of shunt-coupled ARFRs 68.

FIG. 21B shows a portion of the RF circuitry 12 according to oneembodiment of the RF circuitry 12. The RF circuitry 12 includes theacoustic substrate 78. The acoustic substrate 78 illustrated in FIG. 21Ais similar to the acoustic substrate 78 Illustrated in FIG. 21B, exceptin the acoustic substrate 78 illustrated in FIG. 21B, the secondcompensating ARFR 18 is omitted.

Some of the circuitry previously described may use discrete circuitry,integrated circuitry, programmable circuitry, non-volatile circuitry,volatile circuitry, software executing instructions on computinghardware, firmware executing instructions on computing hardware, thelike, or any combination thereof. The computing hardware may includemainframes, micro-processors, micro-controllers, DSPs, the like, or anycombination thereof.

None of the embodiments of the present disclosure are intended to limitthe scope of any other embodiment of the present disclosure. Any or allof any embodiment of the present disclosure may be combined with any orall of any other embodiment of the present disclosure to create newembodiments of the present disclosure.

Those skilled in the art will recognize improvements and modificationsto the preferred embodiments of the present disclosure. All suchimprovements and modifications are considered within the scope of theconcepts disclosed herein and the claims that follow.

What is claimed is:
 1. RF circuitry comprising: a first acoustic RFresonator (ARFR); a first compensating ARFR coupled between a firstinductive element and a first end of the first ARFR; and a secondcompensating ARFR coupled between a second inductive element and asecond end of the first ARFR, wherein: the first inductive element andthe second inductive element are negatively coupled to one another; andthe first compensating ARFR, the second compensating ARFR, the firstinductive element, and the second inductive element are configured to atleast partially compensate for a parallel capacitance of the first ARFR.2. The RF circuitry of claim 1 wherein the first inductive element iscoupled between the first compensating ARFR and ground, and the secondinductive element is coupled between the second compensating ARFR andthe ground.
 3. The RF circuitry of claim 1 further comprising acapacitance circuit coupled between the first inductive element andground and further coupled between the second inductive element and theground.
 4. The RF circuitry of claim 1 wherein a parallel capacitancecompensation circuit comprises the first compensating ARFR, the secondcompensating ARFR, the first inductive element, and the second inductiveelement, such that the parallel capacitance compensation circuit is apassive circuit, which comprises no active components.
 5. The RFcircuitry of claim 4 further comprising the parallel capacitancecompensation circuit.
 6. The RF circuitry of claim 1 wherein an absolutevalue of a coefficient of coupling between the first inductive elementand the second inductive element is greater than zero and less than 0.7.7. The RF circuitry of claim 1 wherein an inductance of the firstinductive element is not equal to an inductance of the second inductiveelement.
 8. The RF circuitry of claim 1 wherein a parallel capacitancecompensation circuit comprises the first compensating ARFR, the secondcompensating ARFR, the first inductive element, and the second inductiveelement, such that the parallel capacitance compensation circuit isconfigured to increase a ratio of a parallel resonant frequency of thefirst ARFR to a series resonant frequency of the first ARFR.
 9. The RFcircuitry of claim 8 wherein the first ARFR and the parallel capacitancecompensation circuit are configured to function as an RF bandpassfiltering element, such that the parallel resonant frequency fallsoutside of a passband of the RF bandpass filtering element.
 10. The RFcircuitry of claim 1 wherein a parallel capacitance compensation circuitcomprises the first compensating ARFR, the second compensating ARFR, thefirst inductive element, and the second inductive element, such that theparallel capacitance compensation circuit is coupled across the firstARFR and is configured to present a positive reactance across the firstARFR, wherein a magnitude of the positive reactance is inversely relatedto frequency.
 11. The RF circuitry of claim 10 wherein the parallelcapacitance compensation circuit is configured to augment RF bandpassfiltering behavior of the first ARFR.
 12. The RF circuitry of claim 1wherein each of the first ARFR, the first compensating ARFR, and thesecond compensating ARFR is a surface acoustic wave (SAW) RF resonator.13. The RF circuitry of claim 1 wherein each of the first ARFR, thefirst compensating ARFR, and the second compensating ARFR is a bulkacoustic wave (BAW) RF resonator.
 14. The RF circuitry of claim 1further comprising an acoustic substrate, which comprises the firstARFR, the first compensating ARFR, and the second compensating ARFR. 15.The RF circuitry of claim 1 further comprising a first antenna, first RFRX bandpass filter, which comprises the first ARFR, the firstcompensating ARFR, the second compensating ARFR, the first inductiveelement, the second inductive element, and a first plurality of ARFRscoupled in series between the first ARFR and a first RF antenna, whereinthe first antenna, first RF RX bandpass filter is configured to receiveand filter a first antenna, first RF RX signal via the first RF antennato provide a first antenna, first upstream RF RX signal via the firstARFR.
 16. The RF circuitry of claim 15 further comprising a firstantenna, first RF TX bandpass filter, which comprises a second ARFR, aparallel capacitance compensation circuit, and a second plurality ofARFRs coupled in series between the second ARFR and the first RFantenna, wherein the parallel capacitance compensation circuit iscoupled across the second ARFR and the first antenna, first RF TXbandpass filter is configured to receive and filter a first antenna,first downstream RF TX signal via the second ARFR to provide a firstantenna, first RF TX signal via the first RF antenna.
 17. The RFcircuitry of claim 15 further comprising a first antenna, second RF RXbandpass filter, which comprises a second ARFR, a parallel capacitancecompensation circuit, and a second plurality of ARFRs coupled in seriesbetween the second ARFR and the first RF antenna, wherein the parallelcapacitance compensation circuit is coupled across the second ARFR andthe first antenna, second RF RX bandpass filter is configured to receiveand filter a first antenna, second RF RX signal via the first RF antennato provide a first antenna, second upstream RF RX signal via the secondARFR.
 18. The RF circuitry of claim 15 further comprising a secondantenna, first RF RX bandpass filter, which comprises a second ARFR, aparallel capacitance compensation circuit, and a second plurality ofARFRs coupled in series between the second ARFR and a second RF antenna,wherein the parallel capacitance compensation circuit is coupled acrossthe second ARFR and the second antenna, first RF RX bandpass filter isconfigured to receive and filter a second antenna, first RF RX signalvia the second RF antenna to provide a second antenna, first upstream RFRX signal via the second ARFR.
 19. The RF circuitry of claim 1 furthercomprising a first antenna, first RF TX bandpass filter, which comprisesthe first ARFR, the first compensating ARFR, the second compensatingARFR, the first inductive element, the second inductive element, and afirst plurality of ARFRs coupled in series between the first ARFR and afirst RF antenna, wherein the first antenna, first RF TX bandpass filteris configured to receive and filter a first antenna, first downstream RFTX signal via the first ARFR to provide a first antenna, first RFantenna TX signal via the first RF antenna.
 20. The RF circuitry ofclaim 19 further comprising a first antenna, second RF TX bandpassfilter, which comprises a second ARFR, a parallel capacitancecompensation circuit, and a second plurality of ARFRs coupled in seriesbetween the second ARFR and the first RF antenna, wherein the parallelcapacitance compensation circuit is coupled across the second ARFR andthe first antenna, second RF TX bandpass filter is configured to receiveand filter a first antenna, second downstream RF transmit signal via thesecond ARFR to provide a first antenna, second RF antenna transmitsignal via the first RF antenna.